If the beam is directed towards Earth, it's called a Pulsar.
A Pulsar.
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Gamma rays
A pulsar is a special kind of neutron star, which is the ultra-dense leftover core of a massive star. Pulsars emit beams of radiation that sweep out in circles as the pulsar spins. When those beams flash over Earth, we see them as regular, repeating pulses of radio emission.
Pulsars and neutron stars emit a beam of electromagnetic radiation.
Neutron stars are able to produce pulses of radiation because they are rotating, and only a certain place on the neutron star releases the radiation(just like how light comes out of a flashlight). As the neutron star rotates, the point on the neutron star also moves along. When it points toward the Earth, we see the pulse.
A supernova (plural: supernovae or supernovas) is a stellar explosion that creates an extremely luminous object.Check the link given for more information.
A pulsar is a rapidly spinning neutron star that releases regular pulses of electromagnetic radiation from its magnetic field
Gamma rays
"Small but very dense" sounds like the description of a neutron star or "collapsed matter star". Theoretically, a black hole (the only thing more dense) has no physical size at all. So, "neutron star". If the neutron star is spinning rapidly, they are called "pulsars" for the radio-wave pulses that they generate.
A pulsar is a special kind of neutron star, which is the ultra-dense leftover core of a massive star. Pulsars emit beams of radiation that sweep out in circles as the pulsar spins. When those beams flash over Earth, we see them as regular, repeating pulses of radio emission.
If it also emits pulses in each rotation, it is called a pulsar.
A pulsar. Neutron stars that are spinning rapidly can generate pulses of X-ray radiation, and are called "pulsars". Interestingly enough, the first discoveries of pulsars were termed "LGM objects", for "little green men"; before the structure was understood, scientists thought that the PRECISELY timed pulses of X-rays might have been some sort of interstellar radio beacons, a galactic electronic navigational aid.
Neutron stars. A neutron star pulses, however if that pulse is detected on Earth it is called a pulsar, even though they are the same thing. See related questions.
Pulsars and neutron stars emit a beam of electromagnetic radiation.
Neutron stars are able to produce pulses of radiation because they are rotating, and only a certain place on the neutron star releases the radiation(just like how light comes out of a flashlight). As the neutron star rotates, the point on the neutron star also moves along. When it points toward the Earth, we see the pulse.
it is a (n) pulsar
Because of their axis of rotation. It that axis is not pointing towards Earth, the pulses are not detected and they are just classified as a neutron star.
Pulsars. They are very dense neutron stars that rotate quickly and very regularly, emitting radiation pulses towards the earth like a lighthouse.